burst (one's) bubble

To bring someone back to reality, especially if they are dreaming or fantasizing about something unrealistic. Look, I hate to burst your bubble, but there is no way you're getting into Harvard! You're a C student!

Common Names:

Name	Pronounced	Usage
Ionela	yo-NEL-ah	Romanian
Aldrin	['ɔ:ldrin]
Filib	-	Scottish
Pema	-	Tibetan, Bhutanese
CristiÁN	kree-STYAHN	Spanish
Wido	-	Ancient Germanic